Renewable safety fuse



Patented oa, s, 1929 UNITED STATES HANS XLASEN, OF COLOGNE-WORBINGEN,GEBMANY BENEWABLE SAFETY FUSE Application led March 19, 1927, Serial No.

Thepresent invention has reference to improvements in safety fuses forguarding elec,- trical circuits and apparatus of various kinds, and itrelates more particularly to a renewable safety fuse of the plug orcartridge type,

and the specific object of the invention is to provide in the safetydevice a conducting and fusible member in the form of' a strip orlamellawhich is held merely by friction between opposed contact clipsand which, upon the fuse -having been blown by overload, can readily bereplaced by a similar lamella without the use of tools. r

My invention will best be understood when described in yconnection withthe accompanying drawing illustrating a preferred embodiment, in whichFig. l is a vertical longitudinal section through the safety device;Fig. 2 is a horizontal section, Fig. 3 a plan view, and Fig. 4 a frontview thereof. l

The cartridge body 1, if insulating (preferably ceramic, material, isprovided with a passage 1a extending therethrough from side to sidethereof for the reception of the fusible linkvlamella 2 and its supportclips 3 and 30 clamping respectively. One end 10 of the body 1 iscovered by the metallic cap 4, and the other end thereof has anipple-'like extensin 100 sheathed by the metallic thimble 40. The

Y 30 j front cover 4 is current-conductingly connected with the metalliccontact clip 3 by the metallic screw pin 5, and the thimble 4 iselectrically connected with the metallic contact clip 3 0 by themetallic screw pin 50. The pins 5 and 50 may be soldered, vriveted, welded, or otherwise current-conductingly secured to the respective covermembers 4 and 40. The pins are threadedat their inner ends, and thecontact clips 3 and '30 have an internal thread and coact with the pinsandl act as nuts to retainl the contact parts in place. etweenthe clipsalamella 2 of a suitable fusible materialis inserted, Whose clamped endportions, after the fuse has 1 blown, can readily be removed for theinser- --tion of a fresh lamella.

Bjr-theprovision of the passage extend- 111g entlrely through the bodytwo open s ides are presented throuvh either one of which a 176,720, andin Germany December 3, 1926.

ing lgreater convenience in applying and re moving fuses when the fuseholder is arranged in a confined space, as well asV greater conveniencein assembling the parts of the fuse holder in the factory. In the eventalso of the sticking of a blown fuse, or of the necessity of adjustingor replacing a clip, where the fuse holder is arranged in a contractedspace, these opposite open sides permit of the introduction of thefingers or tools from both sides, so that the fuse may be released andremoved or the clip adjusted or repaired with greater ease andexpedition.

In a renewable safety fuse of the character set orth,'in combination, aceramic body havinv an opening extending therethrough from si e to sidethereof, a reduced cylindrical extension integrally projecting from oneend face of'said body, a metallic cover for said reduced body extension,a metallic cover for the other end of the body face, metallic screw pinsextending from the said metal covers through the ends of said body intothe opening, metallic contact clips threaded on the inner ends of saidscrew pins for clamping coaction with -the respective metal covers, anda fusible lamella held between said con-V tact clips and adapted to beapplied and removed through either side of the opening in the body. v

In testimony whereof I aix 1n signature.

. HANS ASEN.

fuse may be inserted and-removed, thus givv

